Negotiating with dealers through email?

We completed and took delivery of two 2019 Chev Equinox with the Convenience package. This makes our third and fourth Equinox. We ended up with $445 DAS and $200 a month for 24 months. How did we get this? Visited dealer web sites and looked for “specials” and noted who was being aggressive. Made a connection with internet sales and asked for a quote on the vehicle mentioned and specified that DAS was limited to 1st month plus tax and plate transfer. Some offered ridiculous figures and some were serious and were a pleasure to deal with. Some dealers checked back and offered to make a more aggressive bid. When I arrived at what I thought was a fair deal both ways. We asked for a list of docs needed and sent them in and scheduled a closing and closed. No visits to the dealership until closing. Did have one issue with the F & I guy who offered extra damage protection for $94/month for 24 months. (a truly ridiculous and rip-off offer) It took a couple of polite refusals before the F & I guy got the message and we got down to doing what we were there for…sign doc’s and close. The F & I guy was so intent on trying to sell his “insurance” he didn’t even bother to explain any of the numbers on the contracts…just pointing to where we initial and/or sign. We like the new Equinox’s very much. Dealerships should stick to selling and leasing vehicles and stop trying to be insurance sales people…they do a bad job at insurance sales and it is obvious that they withhold final approval in hopes of conning the unsuspecting into exorbitant junk insurance. This probably nets folks with poor credit that can least afford the added charge. They say “a sucker is born every day”…at some point auto companies will wise up and stop looking the other way and demand honesty from the dealers.Until then “Caveat Emptor”…